Dynamometer



Dec. 11) H. B. PEPER DYNAMOMETER Filed April 29. 1922 I5 Sheets-Sheet 1 INVENTOR.

H. B. PIEPER Dec. l1 1923.

DYNAMOMETER Filed April 29.

1922 3 Sheets-She et 2 INVIEN TOR. Y H5. Pzepe?? NSK Dec. 11 1923.

H. B. PIEPER DYNAMOMETER Filed April 29, 1.922 3 Sheets-Sheet 5 'NVENTR 5PZ BY if ATTORNEY Patented Dec. 11, 1923.

, UNITED STATES HERMAN B. PIEPER, OF DAVENPORT, OWA.

DYNAMOMETER.

Application filed April 29, 1922.

Serial N'o.Y 557,439.

(FILED UNDER THE ACT 0F MARCH 3, 1883, 22 STAT. L., 625.)

To all 107mm t may concern.'

Be it known that l, HERMAN B. PIEPER, a citizen of the United States, and a resident of Davenport, county of Scott, and State of Iowa, have invented an Improvement in Dynamometers, of which the following is a specilication. y

The invention described herein may be used by the Government, or any of its oficers or employees in prosecution of work for the Government, or by any other person in the United States, without payment to me of any royalty thereon.

The present invention relates to Dynam'ometers.

It has heretofore been usual in certain types of dynamometer to keep the piston in continuous oscillatory motion about its axis through means of a crank arm in order that the pencil or indicator might work properly. lf the operator is not skillful and exceedingly careful in manipulating the crank arm the piston may bind or stick in the cylinder thus destroying the accuracy of the pressure indication given. f

The present invention has been devised to overcome this defect and to render the-movement of the piston continuous without lia-- bility of binding or sticking.

lith the foregoing and other objects in view, my invention resides in the novel arrangement and combination of parts and in the details of construction hereinafter described and claimed, it being understood that changes in the precise embodiment of the invention herein disclosed may be made within the scope of what is claimed without departing from the spirit of the invention.

One practical embodiment of the invention is illustrated in the accompanying drawings, wherein:

Fig. 1 is a view in side elevation of a dynamometer constructed in accordance with the invention;

Fig. 2 is a plan view of the same;

Fig. is an enlarged view in elevation of a pressure cylinder with the usual crank arm thereon; and

Fig. 4 is a vertical section of a pressure cylinder equipped with my improvement.

Referring to the drawings by numerals of reference:

The dynamometer herein shown by way of illustration consists of a body plate 1() to which are secured the front, middle and rear stands 11, 12, and 13 respectively',

The front stand may be constructed with a suitably formed base having a bifurcated upper portion in which is secured a bracket 14,forming a bearing for a lower roller 15, and bridgingthe upper portion is a bracket 16 in which the upper roller 17 is journaled. Brackets 18 are secured to the base in which brackets, side rollers 19 are journaled.

The middle stand 12 is similar to the front stand and carries a similar roller 15 and side 'rollers 19. Pivotally mounted in the middle stand 12 is a lever arm 20, formed with an extension 21 adapted to engage a rear plate 22 which is adapted to contact with the rear end of a gun cradle to be tested, which cradle is mounted between the lower side and upper rollers.

The rear stand 13 has mounted thereon a casing 24 which may connect with the upper portion of the middle stand by means of spaced apart side beams 25-25, which may conveniently be formed of channel stock.

Within the casing 24 is journaled a worm wheel, meshing with a worm formed on a shaft 27 likewisejournaled inthe casing with its ends extended therebeyond. On one extending end of the sh aft 27 is secured a pulley 28 through which power from any suitable source, such as an electric motor, not shown, may be supplied, while on the other extending end is secured a pinion 29 which is in mesh with one element of a gear train 30 through which a limit switch housed in the casing 31 is operated to cut off the power.

The hub of the worm wheel 26 is threaded interiorly to receive a threaded rod 32 which extends horizontally between the side beams 25 and which is formed with an enlarged portion on which is mounted a cross head 33. The rear end of the rod 32 may be tapped to receive a bolt 34 surrounded by a coiled spring 35 confined between a spider 36 surrounding the bolt and normally resting against the rear face plate in the housing 24, and a washer 37 which encircles the bolt and rests against the head thereof, the whole servingas a buffer for the rod.

The forward end of the rod 32 is formed for connection through a clevis 38 with the recoil mechanism of the gun cradle.

Connected to one side of the cross head 33 is a cord 39 which passes about pulleys -40, suitably mounted on one side beam 25, Iand thence over a pulley 4l geared to a drum 42, carried on a bracket 43 mounted on a pressure cylinder 44, which is in communication through a pipe 45 with a cylinder 46 carried on a base 47 mounted on the main base l0. rlhe piston rod 48 o the pressure cylinder 44 is connected to a lever arm 49 carrying a marker or pencil 50, Which rests against the surface or the drum 42. The cylinder 46 is likewise in communica.- tion through a pipe 5l with a pressure gauge 52.

Mounted in the cylinder 46 is a piston 53 having a rod or stem 54 which passes through the head of the cylinder and which is tapped to receive an adjusting screw 55 against which the end or the lever 20 rests so as to communicate movement or the Work to the piston, and upon this stem is usually clamped a crank arm 54 through which the piston may be manuallyT oscillated While the device is in operation in order that the piston may be kept absolutely free and all binding or sticking thereof avoided.

The present invention is designed to replace this lever and constitutes an improvement thereover. ln the structure herein shown by Way or illustration, l may conveniently use a sheave 56, clamped upon the piston stem in place of the crank-arm, and about which is looped a cable 57 one end of Which passes over pulleys 58 carried in brackets secured to the middle stand and is lastened t0 the cross-head 33 and the other end or which passes over similar pulleys 58 carried in brackets secured to the rear stand and is tas-tened to the cross-head.

As will be readily understood, when the device is'` in operation and consequent movement of the rod 32 is had, the cross head will draw the cable 57 causing oscillation of the sheave 56 and piston 53 during the entire time that the rod 32 is in motion.

invasie W hat l claim is:

l. rllhe combination with a dynamometer, including a support for the ivorl to be tested7 a leve-r carried by the support and engageable with the averli7 a pressure cylinder, a piston in the pressure cylinder actuated by the lever, a rod adapted to be connected to the Work and operable to move the same, a cross head arried by the rod, of a sheave connected to the piston and a cable passing about the she-ave with its ends connected to the cross head, Vvvhereby the piston is oscillated about its axis as the Work is reciprocated.

2. rlhe combination with a dynamometer, including a support for Work to be tested, mechanism for reciprocating the Work, a pressure cylinder, a piston reciprocable in the cy inde and means engaging the Work and operable to reciprocate the piston, of a sheave connected to the piston land a cable passing about the sheave With its ends connected to the Work reciprocating mechanism, whereby the piston is oscillated about its axis as lthe Work is reciprocated 3. rlhe combination with a dynamonieter, including mechanism for reciprocating` the Work to be tested, a pressure cylinder, a piston reciprocable in the cylinder and means engaging the Work and piston for communieating movement of the Work to the piston, of means connected to the piston and Work reciprocating mechanism for oscillating the piston about its a-is as the Work is reciprocated.

4, The combination with a d ynamometer,

including mechanism ttor moving the Work to be tested, a cylinder, a piston reciprocable in thecylinder and means engaging the Work for communicating movement of the Work to the piston, of means. connected to the piston and Work moving mechanism for oscillating the piston about its aXis'as the Work is moved.

p HERMAN B. PIEPER. 

